Materials Flashcards
What are ferrous metals
Metals that contain iron
What are non ferrous metals
Metals that don’t contain iron
Natural fibre fabrics
Fibres grown by plants or animals
What are Synthetic fibre fabrics
Fibres manufactured from chemicals
What are thermopolymers
Polymers that are soft when heated
What are thermosetting polymers
Polymers that once set cannot be reshaped
What are papers and boards
Made in sheets from wood pulp
What are natural timbers
Wood grown from trees
What are manufactured timbers
Wood fibres or plies glued together in sheets
How does a producer decide which materials to use
Through properties e.g. durability, cost
Name at least 5 properties
Density, compressive strength, tensile strength, hardness, durability, cost , strength to weight ratio, stiffness, elasticity, impact resistance, plasticity, ductility, brittleness, corrosive resistance, water resistance, absorbency, flammability, electrical conductivity, thermal conductivity.
What is a polymer
A chain of monomers (can be natural or synthetic)
additive, what is it used for (hint:polymer)
An additive is used to change a polymers properties to suit intended use
Properties of hardwood timbers
Sheds leaves during autumn and winter, grows during spring and summer so grows more slowly, grain and growth rings are closer together, less sustainable.
Properties of softwood timbers
Grows all year so grows quicker, more sustainable, has needles present all year(evergreen), grain and growth further apart
Properties of manufactured timbers
Very uniform grain structure, can be made from recycled timber so quite sustainable
What are smart materials
Materials that have properties which change irreversibly depending on changes in environment
What is a composite material
A material produced from two or more different materials
Put these in order of thinnest to thickest and name the shape: dowel, strip, square, plank, board
Strip(smaller then boards), boards (smaller then plank), plank(largest section), (these tree are a thin rectangle shape), square same height and width, dowel solid rod
What is oscillating motion
Movement back and forth along a curved arc. Measured in
oscillations per second or minute.
What is reciprocating motion
Movement back and forth along a straight line. Measured in
oscillations per second or minute.
What is rotary motion
Movement following the path of a circle. Measured in revolutions
per minute.
What is linear motion
Movement in a straight line. Measured by dividing the distance
covered by time taken ie. Mps, Kph, Mph.
example of class 1 lever
Seesaw, scissors
Example of class 2 lever
Wheelbarrow
Example of class 3 lever
Stapler
What is nanotechnology
Technology on a molelecular scale
What is additive manufacture
The use of CAD/CAM to create designs layer by layer.
